Nut lock



Dec. 20, 1938. P SQRENSEN 2,141,071

NUT LOCK Filed March 24, 1956 .18 18 jjfg 17a RPM SEN W ATTORNEY.

- 1, ,g @OINVENTOR.

Patented Dec. 20, 1938 UNITED STATE This invention relates as one of its principal objects to for locking a nut onto a it cannot easily be tampered Another object of this NUT LOCK Henry Peirce Sorensen, Detroit, Mich. Application March 24, 1936, Serial No. 70,558

3 Claims.

to nut locks and has provide a means bolt in such a way that with.

invention is to provide a means for looking a fastening member in such a way that it cannot be that thieves ordinarily ca ily be removed by a prop More specifically, it is removed with the tools rry but which can readerly equipped mechanic. an object of this invention to provide economical means for fastening automobile accessories, such as radios and heaters, in place on the a way that they cannot unauthorized persons.

In the drawing,

dash

of a vehicle in such be readily removed by Figure 1 is a front elevation of one of the preferred embodiments of the invention, showing the device partly installed.

Figure 2 is a rear elevation fore installation.

of the device be- Figure 3 is a section on the line 3--3 of Figure 1 taken in the Figure 4 is a section direction of the arrows.

similar to Figure 3 but showing the device completely installed.

The embodiment of drawing is illustrated in ing a member H), which the invention shown in the connection with securmay be the frame of a radio, for example, to a second member H, which may be the dash of a motor vehicle.

The embodiment illustrated comprises a frusto-conical body l2 whose larger side the face of the dash or smaller side of the body I ter-bore or recess a smaller hole M extends is adapted to fit against other member I l. The 2 contains a large counl3 from the bottom of which on through to the other side. A bolt l5 passes through aligned holes in the two members Ill and I4 in the body l2 and is ing at the bottom of the c I I and through the hole secured by a nut I6 1younterbore l3.

The space in the counterbore l3 around the felt or the bolt I5 is filled with I! having a low melting point,

in position and prevents acder, such as is used for lead pipe, is especially suitable it forms a pasty mass held and pushed into place in'the other pad held in the or other easily fusible metal,

walls of the recess, is on Ila extending into a in near the bottom of exterior of the body l2.

dditional means for an.

choring the solder, th

s PATENT OFFlE e hole [8 serves as a drain when it is desired to melt and remove the solder I! to allow the nut Hi to be reached and removed.

When the nut-lock is used on a horizontal or sloping and upwardly facing surface, such as the upper portion of the dash of many motor vehicles, it might be difficult to remove the solder H from the recess l3 hole l8 were absent.

present, it is only necessary to a temperature at whichthe uid, using a torch the molten solder containing it if the drain With the drain hole [8 to heat the nut lock solder I! is liqother heating means, and runs out, even when the device is used on an upwardly facing surface.

The drain hole l8 causes ience when filling the H5 with fusible meta I der is used, because its with a piece of felt no material inconvenrecess l3 around the nut especially if plumbers solouter end is easily blocked or other material held over it or by a piece of clay or putty forced into it.

Proper orientation of the body l2 so that the drain hole l8 leads downward from the recess I3 is ensured by a lug or back of the body [2 i 20 in the dash ll. nut look from being IS in order to unscrew moving the solder l1.

When the nut lock The lug turned around on the bolt l9 projecting from the a suitably placed hole l9 also prevents the key nto the nut IS without reis in place, and filled with solder, it cannot be removed except by the prolonged application of solder, a process enough heat to melt the which cannot be carried out quickly and unobtrusively. Because the sides of the body [2 are sloping, it is impossible to grip it with a pipe wrench or similar tool and apply enough force to shear off the lug I!) or break the bolt.

From the above description, it will be seen that I have provided a theft-proof nut lock which is easily applied and readily removed with the proper tools, and which at the same time is simple and inexpensive.

Various changes in without departing from tion, and I therefore construction may be made the spirit of my invendesire to be extended protection within the scope of the appended claims,

wherein:

What I claim is: 1. In combination,

lock for said nut comprising a a bolt having a nut, a nut hard metal on velope having an anchorage means for cooperation with an adjacent surface, a soft metal covering for said nut residing within the contour of said envelope, and lease of said soft meta drainage means for the re- 1 from said envelope under heating, said drainage means constituting means for restraining said soft metal against movement relative to said envelope.

2. In combination, a bolt having a nut, a nut lock for said nut comprising a hard metal envelope having an anchorage means for cooperation with an adjacent surface, a soft metal covering for said nut residing within the contour of said envelope, and drainage means for the release of said soft metal from said envelope under heating, said drainage means constituting means for restraining said soft metal against movement relative to said envelope, said envelope having a circular formation in any cross section parallel to said adjacent surface and having diverging sidewalls.

3. In combination, a bolt having a nut, a nut lock for said nut comprising a hard metal envelope having anchorage means for cooperation with an adjacent surface and a soft metal covering for said nut residing within the contour of said envelope, said envelope having a frustoconical shape and a recess in the smaller base thereof for residence of said nut and said soft metal, said envelope having a passageway from said recess to the sidewalls thereof, said passageway being normally filled with said soft metal and constituting both an anchorage means for said soft metal and a drainage means for said soft metal upon melting thereof.

HENRY PEIRCE SORENSEN. 

